Frost dates · Massachusetts
When is the first frost in Boston?
In a typical year, Boston’s first frost comes around November 9 and its last around April 4.
One year in ten the first frost comes as early as October 29, and nine years in ten it has arrived by November 22. One year in ten the last frost is over as early as March 25, and nine years in ten it is over by April 17. Boston averages about 92 nights a year at 32°F or colder, with about 218 frost-free days in between in a typical year. It’s frost season here, and the last frost usually comes around April 4. That makes it the 31st latest first frost of the 117 cities we track where it freezes most years.
Last updated
No freeze in the forecast for the next 48 hours.
Boston’s first frost holds off until November, because the harbour refuses to cool down without a fight.
Live 48-hour check from OpenWeatherMap, refreshed about every half hour. Alerts from the National Weather Service.
Frost dates, early, typical and late years
| Early year (1 in 10) | Typical | Late year (1 in 10) | |
|---|---|---|---|
| First frost | October 29 | November 9 | November 22 |
| Last frost | March 25 | April 4 | April 17 |
A frost date here is a night when the official thermometer reads 32°F or colder. Frost on the ground can show up on clear, calm nights a few degrees milder.
Cities with about the same first frost
- Chattanooga, Tennessee: first frost around November 9
- Little Rock, Arkansas: first frost around November 10
- Newark, New Jersey: first frost around November 10
Source: NOAA U.S. Climate Normals, 1991 to 2020, station USW00014739.